feat: 新增模型切换事件订阅功能

[BAKAOLC]

变更内容

本次更新新增了模型切换事件订阅功能，允许其他模块监听并响应模型切换操作。

主要变更

• 新增 ModelChangedEventArgs 事件参数类 (DuckovCustomModel.Core/Data/ModelChangedEventArgs.cs)

  • 包含目标类型 (ModelTarget)
  • 模型ID和名称
  • AI角色名称键（如适用）
  • 是否恢复原始模型
  • 操作是否成功
  • 处理器数量

• 在 ModelListManager 中添加 OnModelChanged 静态事件

  • 支持订阅模型切换、恢复等操作的通知
  • 在成功和失败情况下都会触发事件

• 在以下方法中触发事件：

  • ApplyModelToTarget - 应用模型到目标时
  • ApplyModelToAICharacter - 应用模型到AI角色时
  • RestoreOriginalModelForTarget - 恢复原始模型时

使用示例

// 订阅模型切换事件
ModelListManager.OnModelChanged += OnModelChanged;

// 事件处理函数
private void OnModelChanged(ModelChangedEventArgs args)
{
    if (args.Success)
    {
        if (args.IsRestored)
        {
            ModLogger.Log($"模型已恢复: {args.Target}, 处理器数量: {args.HandlerCount}");
        }
        else
        {
            ModLogger.Log($"模型已切换: {args.ModelName} ({args.ModelID}), 目标: {args.Target}");
        }
    }
}

// 取消订阅
ModelListManager.OnModelChanged -= OnModelChanged;

版本信息

• 版本号：v1.8.10
• 已更新 CHANGELOG.md 和 CHANGELOG_EN.md

[Copilot]

Pull request overview

This PR merges the develop branch into main, introducing a new model change event subscription feature that allows external code to subscribe to model switching notifications.

Key changes:

• Added OnModelChanged event to ModelListManager for real-time model change notifications
• Created ModelChangedEventArgs class to encapsulate event data including target type, model ID, success status, and handler count
• Event invocations added to all model application and restoration code paths, covering both success and failure scenarios

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
DuckovCustomModel/Managers/ModelListManager.cs	Added OnModelChanged event declaration and invocations in ApplyModelToTarget, RestoreOriginalModelForTarget, and ApplyModelToAICharacter methods for both success and failure cases
DuckovCustomModel.Core/Data/ModelChangedEventArgs.cs	New event arguments class containing model change information including target, model ID/name, restoration status, success flag, and handler count
CHANGELOG.md	Added v1.8.10 release notes documenting the new model change event subscription feature in Chinese
CHANGELOG_EN.md	Added v1.8.10 release notes documenting the new model change event subscription feature in English

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